The Medela Pump In Style MaxFlow is a double electric breast pump that comes with 21mm and 24mm PersonalFit Flex Breast Shields, a microfiber bag, and a battery pack. It features a closed system, hospital performance, and is safe for both mother and baby. The pump is easy to use and provides more milk while being comfortable to use. The set includes a power adapter, cooler, 5 oz/150ml bottles with lids, bottle stand, cooling element, complete tubing, and breast shield connectors with membranes.